JP2004193804A - Wireless apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wireless apparatus in a VOX transmission operation without being conscious of a breathing pause, capable of preventing transmission from being finished on the way of talking without the need for an additional circuit. <P>SOLUTION: The wireless apparatus in the VOX transmission operation whose transmission is started when an input level from a microphone exceeds a reference level, is maintained for a prescribed time when the input level is lower than the reference level, and is finished when the input level does not exceed the reference level during the prescribed period, has a transmission start reference level and a transmission end reference level as the reference level, and the transmission end reference level is decreased after a prescribed time from transmission start. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a wireless device.
[0002]
[Prior art]
[Patent Document 1]
JP-A-8-204606
2. Description of the Related Art A wireless device equipped with a VOX (voice operated transmitting) is in a transmission state when an input level (volume) from a microphone exceeds a reference level, and transmits for a fixed time when the input level is lower than the reference level. That is, when the input level does not exceed the reference level within a certain time, the transmission is terminated.
[0004]
FIG. 4 is a time chart showing the VOX transmission operation as described above. The input device exceeds the reference level at point a, so that the radio device is in a transmission state. At this time, the transmission state is maintained. During this fixed time, the input level does not exceed the reference level in this example, so that the transmission ends at the point c after the fixed time t has elapsed.
[0005]
[Problems to be solved by the invention]
However, in the VOX transmission operation as described above, even if there is a sufficient input level from the microphone at the start of transmission, the air volume in the lungs decreases as the length of a single talk increases, so it is conscious. Otherwise, the volume of the spoken voice may decrease, and the input level may fall below the reference level during the speaking, and the transmission may be terminated during the speaking. In addition, if the user talks while paying attention to the reference level so as not to cause such a situation, the timing of breathing becomes unnatural, which may cause discomfort to the receiver and the sender.
[0006]
Therefore, in Patent Document 1, in addition to the above operation, an attenuator is inserted in the microphone input unit to increase the amount of attenuation before the start of transmission, and reduce the amount of attenuation after the start of transmission to enable transmission even with a small voice. .
[0007]
However, in such Patent Document 1, there is a problem that an attenuator and a control means are required in addition to a normal circuit.
[0008]
The present invention has been made in view of the above points, and it is possible to prevent a state of termination of transmission during talking without requiring an additional circuit, and to make it unnecessary to be aware of breathing The purpose is to provide.
[0009]
[Means for Solving the Problems]
The wireless device of the present invention starts transmission when the input level from the microphone exceeds the reference level, and holds transmission for a certain period of time when the input level falls below the reference level. In the radio device of the VOX transmission operation in which the transmission is terminated if the transmission level does not exceed the reference level, the transmission level has a reference level for transmission start and a reference level for transmission termination as the reference levels, and the reference level for transmission termination is a predetermined time after the start of transmission. , The level can be lowered.
[0010]
Further, as a preferred embodiment, after the transmission end reference level is lowered, if the input level from the microphone again exceeds the transmission start reference level, the transmission end reference level before the reduction is reduced. The level is returned to the original high level, and the level is lowered again after the predetermined time. Also, means for detecting a decrease in the microphone input level due to the user's voice to detect the breathing cycle of the user, and in accordance with the breathing cycle detected by this means, sets the level of the transmission end reference level. Means for adjusting the predetermined time until the temperature is lowered.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of a wireless device according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 2 is a block diagram showing an embodiment of the wireless device of the present invention. The wireless device according to this embodiment includes a microphone 11, a transmission circuit 12, an antenna 13, an input level detection unit 21, a transmission start reference level comparison unit 22, and a transmission end reference level provided in a microprocessor 20. A comparison unit 23, a transmission end reference level changing unit 24, a transmission holding unit 25, a transmission time measuring unit 26, a transmission circuit control unit 27, and a transmission start and end reference level storage unit 31 provided in the EEPROM 30 are provided. .
[0012]
The microphone 11 inputs a user's voice. The transmission circuit 12 generates a transmission signal modulated by an audio signal from the microphone 11 and radiates it from the antenna 13 as a radio wave. The input level detecting means 21 detects an input level from the microphone 11. The transmission start reference level comparison unit 22 compares the input level detected by the input level detection unit 21 with the transmission start reference level. The transmission end reference level comparison unit 23 compares the input level detected by the input level detection unit 21 with the transmission end reference level. The transmission holding unit 25 receives the output from the transmission end reference level comparing unit 23 and holds the transmission for a certain period of time. The transmission circuit control unit 27 receives the outputs from the transmission start reference level comparison unit 22 and the transmission holding unit 25, and controls the transmission circuit 12. The transmission time measuring means 26 receives the outputs from the transmission start reference level comparing means 22 and the transmission circuit control means 27 and measures the transmission time. The transmission end reference level changing means 24 receives the outputs from the transmission start reference level comparing means 22 and the transmission time measuring means 26, and changes the transmission end reference level at the transmission end reference level comparing means 23. I do. The transmission start and end reference level storage means 31 stores the transmission start reference level and the transmission end reference level, and stores these reference levels in the transmission start reference level comparison means 22 and the transmission end reference level comparison means 23. Forward.
[0013]
The wireless device thus configured has two types of reference levels for the VOX transmission operation, a reference level for transmission start and a reference level for transmission end, as shown in FIG. The transmission start reference level is set higher than the transmission end reference level. At the start of transmission, the input level from the microphone is compared with the reference level for transmission start. If the input level from the microphone exceeds the reference level for transmission start (T1, FIG. 1), the transmission state is set. When the transmission is started in this way, the input level from the microphone and the reference level for terminating the transmission are compared. If the input level from the microphone falls below the reference level for terminating transmission (T3, T6 in FIG. 1), transmission is held for a fixed transmission holding time t2, and the input level starts to be transmitted within the transmission holding time t2. If it does not exceed the use reference level, the transmission ends (T7 in FIG. 1).
[0014]
The transmission end reference level is set lower than the transmission start reference level, but has two types, a high level H and a low level L. Then, the fixed time t1 is set to the high level H after the start of transmission, but is changed to the low level L (the level is lowered) after the fixed time t1 has elapsed (T2 in FIG. 1). When the input level from the microphone exceeds the reference level for transmission start after changing to the low level L (T4 in FIG. 1), the reference level for transmission end is returned to the high level H, and the predetermined time is set. After t1 (FIG. 1, T5), the level is changed to the low level L again.
[0015]
The VOX transmission operation performed while controlling the transmission end reference level will be described in more detail with reference to the block diagram of FIG. 2 and the flowchart of FIG. When the power of the wireless device is turned on, the transmission start reference level and the transmission end reference level previously stored in the storage unit 31 are transferred to the respective comparison units 22 and 23.
[0016]
When the user inputs a voice from the microphone 11, the input level from the microphone 11 is detected and captured by the detecting means 21 (step S1). If the user is not transmitting (step S2), the input level is compared with the reference level for starting transmission. The comparison is made by the means 22 (step S3). If the input level exceeds the transmission start reference level, the transmission holding counter of the transmission holding unit 25 is cleared (step S4), and the transmission end reference level of the comparison unit 23 is set to the high level H. (Step S5) Further, after the transmission time measuring counter of the transmission time measuring means 26 is cleared (Step S6), the transmission is started by operating the transmitting circuit 12 through the transmitting circuit control means 27 with the output of the comparing means 22. (Step S7) At the same time, the transmission time measuring counter of the transmission time measuring means 26 is started to start measuring the transmission time (Step S8).
[0017]
When the transmission is started, each time the detection unit 21 detects and takes in the input level from the microphone 11, the input level is compared with the reference level for termination of transmission by the comparison unit 23 (step S9). At this time, the transmission time is measured by the transmission time measurement counter of the transmission time measuring means 26, and the input level is compared with the high level H of the transmission end reference level within a fixed time t1 from the start of transmission. On the other hand, when a predetermined time t1 has elapsed from the start of transmission (step S10), the reference level for transmission end is changed to the low level L by the changing unit 24 in response to the output of the transmission time measuring unit 26 (step S11). After the time t1, the low level L and the input level are compared by the comparing means 23. Therefore, even if the volume of the user's speech decreases over time after the start of transmission and the input level from the microphone decreases, the transmission end reference level is changed to the low level L. Is prevented, and the state of transmission termination described later is prevented.
[0018]
In the comparison by the comparing means 23, when it is determined that the input level is lower than the transmission end reference level and the lowering is the first lowering (steps S9 and S12), the output from the comparing means 23 is received and the transmission holding means is received. The transmission holding counter 25 starts (step S13), and the measurement of the transmission holding time t2 is started. If the input level does not exceed the transmission start reference level during the transmission holding time t2, the transmission circuit control means 27 receives the output from the transmission holding means 25 after the elapse of the transmission holding time t2, and The operation is stopped, and transmission ends (steps S14 and S15). On the other hand, if the input level exceeds the transmission start reference level within the transmission holding time t2, the transmission holding counter of the transmission holding means 25 is cleared, and the transmission time measuring counter of the transmission time measuring means 26 is restarted from zero. Then, the transmission state is continued. If the input level exceeds the transmission start reference level after the transmission end reference level is changed to the low level L, the transmission end reference level is once returned to the high level H, and the transmission time measuring means 26 After the predetermined time t1 measured in step (1), the transmission end reference level is changed to the low level L again.
[0019]
As described above, according to the above-described wireless device, the transmission end reference level is changed to the low level L after the elapse of the fixed time t1 after the start of transmission. Therefore, after the start of the transmission, the volume of the user's speech decreases over time, and even if the input level from the microphone decreases, the input level is prevented from falling below the reference level for terminating the transmission. The transmission is prevented from being terminated halfway. Further, even if a conversation using the VOX is performed for a long time, it is not necessary to be conscious of breathing.
[0020]
When the input level exceeds the transmission start reference level after the transmission end reference level is changed to the low level L, the transmission end reference level is once returned to the high level H. When the level suddenly drops from the level state and the input level falls below the reference level for transmission termination, the reduction of the input level is detected without delay at the reference level for transmission termination of high level H, and the transmission is terminated. be able to. Therefore, according to the above-mentioned radio, when the level suddenly drops from the large input level state and it is apparent that the user has finished talking, the transmission can be set to the end without delay and the user speaks. When the volume gradually decreases due to breathing, it is possible to prevent a situation in which the transmission ends in the middle of a talk even if the volume decreases.
[0021]
Further, since the VOX transmission operation as described above can be realized using the microprocessor 20 and the EEPROM (storage device) 30 which are usually provided in any of the radios, as is apparent from FIG. The circuit can be easily realized without cost increase only by modifying the software without the need for a circuit.
[0022]
By detecting the way in which the input level decreases, the breathing cycle of the user can be detected. Therefore, the constant period from the breathing cycle until the transmission termination reference level is changed from the high level H to the low level. If the time t1 is adjusted, it is possible to further avoid the transmission end state in the middle of the talk.
[0023]
【The invention's effect】
As described in detail above, according to the wireless device of the present invention, it is possible to prevent a state of transmission termination during talking without requiring additional circuits, and it is not necessary to be aware of breathing Become.
[Brief description of the drawings]
FIG. 1 is a time chart showing a VOX transmission operation of a wireless device according to an embodiment of the present invention.
FIG. 2 is a block diagram showing an embodiment of a wireless device of the present invention.
FIG. 3 is a flowchart showing a VOX transmission operation of the wireless device according to the embodiment of the present invention.
FIG. 4 is a time chart showing a conventional VOX transmission operation.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Microphone 12 Transmission circuit 13 Antenna 20 Microprocessor 21 Input level detection means 22 Transmission start reference level comparison means 23 Transmission end reference level comparison means 24 Transmission end reference level changing means 25 Transmission holding means 26 Transmission time measurement means 27 Transmission Circuit control means 30 EEPROM
31 Transmission start and end reference level storage means

Claims (3)

Transmission starts when the input level from the microphone exceeds the reference level.If the input level falls below the reference level, transmission is held for a certain period of time.If the input level does not exceed the reference level during that period, transmission is started. In the radio of the VOX transmission operation to be terminated,
A wireless device having a transmission start reference level and a transmission end reference level as the reference levels, wherein the transmission end reference level is lowered after a predetermined time from the start of transmission. If the input level from the microphone again exceeds the transmission start reference level after lowering the transmission end reference level, the transmission end reference level is returned to the original high level before the reduction. 2. The wireless device according to claim 1, wherein the level is reduced again after the predetermined time. Means for detecting a decrease in the microphone input level due to the user's voice and detecting a breathing cycle of the user;
3. The wireless device according to claim 1, further comprising: a unit that adjusts the predetermined time until the level of the reference level for terminating transmission is reduced in accordance with the breathing cycle detected by the unit. Machine.

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